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The Pittsburg & Midway Coal Mining Co. <br />p~M A Chevron Company <br />6400 South Fiddler's Green Circle, Englewood, CO 80111-4991 <br />Mail Address: P.O. Boy 6516, Erglewoad, CO W156b518 <br />August 17, 1999 <br />CDPS Permit CO-0032638 <br />Colorado Department of Health <br />WQCD-PE-BZ <br />4300 Cherry Creek Drive South <br />Denver, Colorado 80222-1530 <br />Deaz Sir/Madam, <br />RECEIVED <br />AUG 191999 <br />Division o(Minerais 8 Geology <br />Enclosed aze the Edna Mine's July water monitoring reports. DMP 001 did not dischazge during <br />the monitoring period. DMPs 004 and 007 had dischazge during the month. <br />All dischazges noted for the monitoring period were within current compliance criteria, except <br />for sulfates at DMP 004. The sample representing the average 30 day value for sulfate was taken <br />on July 6, 1999. Results of the sample's laboratory analysis were not received in time for a <br />second sample to be taken during the monitoring period. Another sample was taken on August <br />3, 1999. The results of that sample were not available at the time of this submittal. <br />The cause of the elevated sulfates pertain to a series of spoil springs and seeps upstream of DMP <br />004. Under normal climatic conditions, precipitation within the watershed serviced by DMP 004 <br />provides sufficient dilution to enable DMP 004 to remain within the permit's compliance criteria. <br />Should DMP 004 continue to exceed the curzent permit criteria for sulfate, P&M may need to <br />submit a request for a permit modification to incorporate a "mass balance" methodology for <br />sulfates using the "dilution factor" criteria currently contained in the permit. <br />Should you have any questions regazding these reports, please contact me at your eazliest <br />convenience. <br />Sincerely, <br />Brian D. Gontarek <br />Sr. Environmental Engineer <br />cc: Mine File <br />CDMG <br />